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Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge
Published on: September 26, 2016
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Fenton process effect on sludge disintegration.
Sayiter Yildiz1, Asuman Cömert1
1Engineering Faculty, Department of Environmental Engineering, Cumhuriyet University, Sivas, Turkey.
International Journal of Environmental Health Research
|February 14, 2019
Summary
The Fenton-type process (FTP) using nanoscale zero-valent iron (nZVI) achieved 31.8% sludge disintegration, significantly outperforming the conventional Fenton-type process (CFP). This advancement offers a more effective method for sewage sludge treatment.
Area of Science:
- Environmental Engineering
- Water Treatment
- Chemical Oxidation
Background:
- Sewage sludge disintegration is crucial for effective wastewater treatment and resource recovery.
- Conventional Fenton-type processes (CFP) show limitations in sludge disintegration efficiency.
- Nanoscale zero-valent iron (nZVI) offers potential for enhanced oxidative degradation.
Purpose of the Study:
- To compare the effectiveness of conventional Fenton-type process (CFP) and Fenton-type process (FTP) using nZVI for sewage sludge disintegration.
- To optimize catalyst iron and hydrogen peroxide dosages for sludge disintegration.
- To analyze the impact of these processes on sludge characteristics.
Main Methods:
- Sludge disintegration experiments using CFP (Fe2+/H2O2) and FTP (nZVI/H2O2).
- Varied parameters included pH, catalyst iron dosage (4 g/kg TS), and H2O2 dosage (10 g/kg TS).
- Analysis of degree of disintegration (DD), soluble chemical oxygen demand (SCODS), particle size, and sludge characterization (SEM, FTIR, XRD).
Main Results:
- FTP achieved a higher degree of disintegration (DD) of 31.8% and soluble chemical oxygen demand (SCODS) of 364 mg/L compared to CFP (DD: 14.1%, SCODS: 256 mg/L).
- Optimal conditions identified as 4 g/kg TS for catalyst iron (Fe2+ and nZVI) and 10 g/kg TS for H2O2.
- Characterization analyses revealed changes in sludge properties post-disintegration.
Conclusions:
- The Fenton-type process utilizing nZVI demonstrates superior performance in sewage sludge disintegration compared to the conventional Fenton-type process.
- Optimized dosages of nZVI and H2O2 significantly enhance sludge disintegration efficiency.
- FTP offers a promising approach for advanced sludge treatment and management.
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